Press the Taxonomy button.  

The member table view will be changed to the taxonomy view with a hierarchical tree-node representation of the inferred view of SNOMED CT. The initial view shows SNOMED CT Concept at the top of the listing in its expanded presentation, revealing the SNOMED CT top-level concepts. 

Each row in this view represents a hierarchy node, and is preceded by one of two icon buttons: 

Child Nodes Expanded icon (icon is a “down arrow/caret”)  

Child Nodes Collapsed icon (icon is a “greater than” symbol) 

A circle appears around the expand/collapse icon to indicate the concept has children with membership. 

Pressing the Child Nodes Expanded or Child Nodes Collapsed icon toggles from one state to the other.     

Definition status icons:

Primitive icon (icon is an empty circle) or

Fully Defined icon (icon is horizontal lines inside a circle).  

Text label showing either the concept FSN or Preferred Term (PT) in the en-US dialect. 

Bolded concepts are members.

Navigate down the taxonomy nodes by successively expanding child nodes. 

Users can open and close any node (except for leaf nodes). 

When a concept is reached that has no child concepts (ie it is a taxonomy "leaf" node), the row entry is preceded with a Leaf node icon (icon is a “minus” symbol), indicating that no further expansion is possible.